Drill-sharpener.



S, HORVATH.

DRlLL SHARPENER.

APPLICATION FILED m1. a. mu.

IL ,23 1 ,258. Patented June 26, 1917.

2 SHEETS-SHEET I.

S. HORVATH.

DRILL SHARPENER.

APPLjcATmN FlLED lAN. 3. IBM.

1,231,258 Patented June 26, 1917.

2 SHE ETS--SHEET 2.

J automatic as the sharpening STEPHEN I-IORVATI-I, OF HIGHLAND PARK, MICHIGAN.

DRILL-SHARIENER.

Specification of Letters Patent.

Patented June 26, 191?.

Application filed January 3, 1917. Serial No. 140,432.

To all whom it may concern:

Be it known that I, STEPHEN HoRVATiI, a citizen of the United States, residing at Highland Park, in the county of Wayne, State of Michigan, have invented certain new and useful Improvements in Drill- Sharpeners; and I do hereby declare the following to be a full, clear, and exact de scription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in sharpening machines, and particularly to machines for sharpening drill bits.

One object of the present invention is to provide a novel and efficient device of this character which is arranged to turn the bit back and forth as the sharpening member rubs thereagainst.

Another object of the present invention is to provide a device of this character in which bits of difl'erent diameters may be conveniently held to be sharpened and in which the oscillating movement of the bit is action proceeds.

Other objects and advantages will be apparent from the following description when taken in connection with the accompanying drawing.

In the drawing:

Figure l is an elevation of a drill sharpening machine made in accordance with my in vention.

Fig. 2 is a front elevation of the same.

Fig. 3 is a top plan view of the device.

Fig. 4- is a horizontal sectional view taken on the line H of Fig. 1.

Fig. 5 is a vertical sectional view taken on the line 5-5 of Fig. 1.

F ig. 6 is a horizontal sectional view taken on the line 66 of Fig. 1.

Referring particularly to the accompanying drawing, 10 represents a base which is adapted to be secured to the surface of a table or bench, near the edge thereof. EX- tending vertically from the base, and forming an integral part thereof, is a casting 11, one portion 12 of which extends vertically and is formed with a longitudinal bore 13 for the reception of the vertical shaft 14, another portion extends at an acute angle upwardly, as at 15, and is formed with a longitudinal bore 16 for the reception of the shaft 17. Mounted in the lower end of the vertical portion 12 is a transverse shaft 18, on which is secured a bevel pinion 19 which meshes with a similar pinion 20 on the lower end of the vertical shaft 14. Also secured on the transverse shaft is a fly wheel 21, provided with a crank handle 22 for rotating the same. The periphery of the fly wheel is formed with teeth to produce a bevel pinion 23 which meshes with a similar plnion 24 on the lower end of the inclined.

revolve in a plane at an angle to the horizontal. In the upper middle portion of the casting there is formed a vertical opening 26, and disposed in this opening is a vertical. stem 27, which supports a sleeve 28, carrying a pair of horizontally disposed and superimposed disks 29. Each of these disks is formed, near its periphery, with a series of openings of different sizes which correspond to the diameters of the drill bits to be sharpened, and which bits are passed downwardly through the said openings. It will, of course, be understood that the openings of one disk registers with those of the other disk, whereby the drill will be held in vertical position while its point rests on the surface of the grinding stone or disk. The bit is formed, at its upper end, with a squared or angular portion which fits in the chuck of the drill, and receiving this angular end is a socket member 30. Extending upwardly at an angle from this socket member is an arm 31, which is connected to a crank 32 on the upper end of the vertical shaft 1 1, by means of a connecting rod or link 33. These parts are so proportioned that the drill bit will be turned half way around first in one direction and then in the other while the crank makes a complete revolution.

Thus by turning the wheel by means of the drill bit, while the latter turns the grind ing disk, continuously against the point of the bit. When one side of the bit has been sharpened, the socket member is removed, the bit turned around and the socket member again replaced and the device operated as before until the bit has been sufliciently sharpened.

By means of the dilferent openings in the horizontal disks bits of accommodated. Also, by means of the net screw 34-, which holds the vertical. stem from different sizes can he turning, the disks can be conveniently rotated to bring the proper openings in position to receive the bit.

What is claimed is:

A drill bit sharpener including a frame, a Vertical shaft supported in the frame and extending thereabove, a second shaft supported in the frame and arranged at an angle to'the first shaft, the upper end of the second shaft carrying a sharpening disk, a common driving means connected to the lower ends of the two shafts, a crank on the upper end of the first shaft, apitman connected to the crank, a chuck mo'vably carried by the other end of the pitman, a pair of superimposed and horizontally rotatable Copies of this patent may be obtained for five cents each, by addressing the disks mounted shafts and formed with series of openings of different diameters, said chuck being arranged to receive a drill bit therein, said openings in the disks being in vertical alinement for the reception and guidance of the drill bit, the point of the bit to be sharpened being supported on the face of the sharpening disk.

In testimony whereof, I affix my signature, in the presence of two witnesses.

STEPHEN HORVATH.

T. A. HAMORY.

Commissioner of Patents,

Washington, D. G.

on the frame between the' 

